Hello there, I myself use the Freeswitch / FusionPBX for my personal phone server and I have been responsible for developing a multi-lingual call centre using a Debian / Freeswitch / FusionPBX stack. I am a native English speaker so nothing should be lost in translation. I have previously worked with Mark Crane, the developer of FusionPBX so am fully capable of debugging and resolving any issues that you may be having.
I would need access to the FusionPBX website and SSL access to the underlying server in case I need to edit the FusionPBX source / configuration files directly. The error for this is usually due to the fact the FusionPBX hasn't updated it's source for the CDR records to the database.
Hope to hear from you soon.
/R.